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Why does my furnace make a whistling noise when the blower comes on?

Furnace is Sears 60 Economy model #86776613. There is a loud whistling noise when the blower engages. I can remove the access door to the blower and the noise stops. Where do I look for the invasion of air that causes the whistle?

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1 Answer from this member:
scott d
by scott d Earned 1,575 community points in HVAC
October 12th, 2009
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